For any test the best results will be when the connection is wired, there is no AV software, no proxy involved, no VPN.
Realistically your first result will be of the right order.
Have Task Manager running with the network tab visible. Try the Ookla test and watch teh graph, try the TBB test and watch - they will be similar and then try the option with a proxy - what does it look like? Same amplitude or four times? I would guess at the same. Task Manager is always there as a sanity check - you can see if you are getting "something just over 10Mbps" but there is not the resolution for 11.5Mbps.
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